<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var str = 'qwerqwerq'

    console.log( str.replace('q', '人') )  // 替换

    // console.log( str.replace(/q/ig, '人') )

    console.log( str.split('q') )  // 分割  数组
  </script>
</body>
</html>